i am very familliar with vixion block... you got a very fast stock sniper... 150 - 160kph... with my sniper i can only top it along 130 - 140 without docking at all... and my weight is 96 kilos...
some of my friends got a vixion block...they can reach even 170kph...
one of the vids that can prove that a vixion block can run as 170 is this...
the blue x1r got a vixion block installed... we nicknamed him as boy atang... the vixion 170 topper...
and his mechanic is @
kimredbull i really wonder why your friends vixion setup cant run 140kph more...